Black Dragon Mask

Gain resistance to acid damage, if resistant, gain immunity. Add your Cha. mod. to AC. If you have breath weapon that requires rest to recharge, now recharges on 6. You gain an additional dark vision of 60 feet, or 60 feet if none. You can speak and understand draconic and have advantage on Cha. checks against black dragons. Legendary resistance (1/day), spend to succeed failed save. You can breathe underwater.